I am a long time reader of the forum but finally had to join to ask a question.

I have a 2003 Liberty with a 3.7 V6. The other day while replacing the coolant temp sensor I had a bit a an accident with the hot wire off the alternator which blew a hole in the fuel rail. (Fire was involved and it wasn't fun. The lesson here is to always disconnect the battery right after you open the hood to do any work. I should have paid attention in shop class in high school.)
Anyway, I replaced the fuel rail with one off a salvage vehicle and everything seemed to be running great until I realized that the Jeep is now getting very poor MPG (around 7 mpg instead of 14-17) The Jeep is also idling very slightly rough, but there is no lag in acceleration and the rough idle could have been happening before but now I am sensitive to it. There was some slight damage to the crank case vent tubes but they were still air tight and not leaking.

When I replaced the fuel rail I sprayed the replacement out with sensor safe intake cleaner and I have checked for any leaks between the rail and injectors and everything looks great. I am not getting any check engine lights or anything. Before I start replacing everything under the hood and pulling the rail and injectors I figured I would post to the forums to see if anyone had an idea what could be causing the issues.